Borla 140339 Stainless Steel Cat-Back Exhaust System Using Borla's patented multi-core technology, this exhaust system for the Infiniti FX50 2009 is one of the most aggressive and fantastic performance modification exhaust pieces available With 4.5 inch round exhaust tips, the visual styling this exhaust offers is also an undeniable upgrade 2.25 inch tip Dimensions: 4.5 inch RD X 7.75 inch